caoquyen164
Junior Member level 2
Hi all,
I'm designing a bias sequence circuit for GaN Power Amplifier, the same as "AN11130-Bias module for 50 V GaN demonstration boards".
the problem is in the off-state. the gate voltage should be goes from -5 to 0 after the drain voltage goes down to zero. It can be fine if I insert a control signal to turn off Vdrain then turn off the Vgate. but in the case the power/battery is shut down suddently, the thing will go bad, the PA IC may be damaged.
I need to extend the life time of -5V power line about 100ms after the power supply is shut down suddently. I tried to insert a RC delay or a large capacitor in -5V line, but they do not work. can anybody help me ? tks.
I'm designing a bias sequence circuit for GaN Power Amplifier, the same as "AN11130-Bias module for 50 V GaN demonstration boards".
the problem is in the off-state. the gate voltage should be goes from -5 to 0 after the drain voltage goes down to zero. It can be fine if I insert a control signal to turn off Vdrain then turn off the Vgate. but in the case the power/battery is shut down suddently, the thing will go bad, the PA IC may be damaged.
I need to extend the life time of -5V power line about 100ms after the power supply is shut down suddently. I tried to insert a RC delay or a large capacitor in -5V line, but they do not work. can anybody help me ? tks.